webpack.config.js

const webpack = require('webpack');
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
  entry: [
    // entry point of our app
    './client/app.jsx',
  ],
  output: {
    path: path.resolve(__dirname, 'dist'),
    publicPath: '/',
    filename: 'bundle.js',
  },
  devtool: 'eval-source-map',
  mode: 'development',
  devServer: {
    static: {
      // match the output path
      directory: path.resolve(__dirname, 'dist'),
      // match the output 'publicPath'
      publicPath: '/',
    },
    /**
     * proxy is required in order to make api calls to
     * express server while using hot-reload webpack server
     * routes api fetch requests from localhost:8080/api/* (webpack dev server)
     * to localhost:3000/api/* (where our Express server is running)
     */
    proxy: {
      '/user/**': 'http://localhost:3000/',

      '/main/**': 'http://localhost:3000/',

    },
  },
  module: {
    rules: [
      {
        test: /.(js|jsx)$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-react', '@babel/preset-env'],
            plugins: [
              '@babel/plugin-transform-runtime',
              '@babel/transform-async-to-generator',
            ],
          },
        },
      },
      {
        test: /.(css|scss)$/,
        exclude: /node_modules/,
        use: ['style-loader', 'css-loader'],
      },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './client/index.html',
    }),
  ],
  resolve: {
    // Enable importing JS / JSX files without specifying their extension
    extensions: ['.js', '.jsx'],
  },
};